708
ROM
U309
709 ROM
U310
710 ROM
U311
Check-sum error of program ROM A2U309.
Check-sum error of program ROM
A2U310.
Check-sum error of program ROM A2U311.
RAM Check Errors (711 to 719)
The instrument power-on diagnostics check the program RAM. This
includes the two
RAMS
used for STATE storage. If any STATE
information is found to be invalid, all data in that RAM is destroyed.
A separate error code is generated for each defective program RAM.
All RAM is battery-backed. See State and Trace storage in Chapter 9.
711 RAM
U303
712 RAM
U302
713 RAM
U301
714 RAM
U300
Check-sum error of system RAM A2U303.
Check-sum error of system RAM A2U302.
Check-sum error of system RAM
A2U301.
Check-sum error of system RAM A2U300.
Microprocessor Error (717)
717 BAD
UP!!
Microprocessor not fully operational. Refer to Chapter 9, “Controller
Section.”
Battery Problem (718)
718 BATTERY?
Nonvolatile RAM not working; check battery
BTl.
This error can also be generated if the battery has been disconnected
then reconnected. If this is the cause, cycling power clears the error.
If STATE or TRACE data is found to be corrupt, the processor tests
the display
RAMS
and the program
RAMS
containing the STATE
information. If the
RAMS
are working properly, this error message
is generated. To check the
BTl
Battery and the battery backup
circuitry, refer to “STATE and TRACE Storage Problems” in Chapter
9.
General Troubleshooting 6-33
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